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1.
Lame sss consultant-speak meaning to come to a mutual, general understanding regarding a topic or issue.
Frequently used by clueless Accenture employees when they don't have any clue as how to approach a problem, thus buying them some time to cobble a B.S. plan together.
Let's get together after this fifteenth unproductive cluster-F meeting and 'synch-up'.
by SnoopDO-doubleGizzle December 08, 2003
 
2.
More lame-ass consultant speak, typically used by Accenture and Deloitte employees, as mentioned above, meaning to catch up or meet with someone.
"Hey, Jaime, let's synch-up for lunch at Champps"
by Some Consultant April 20, 2004